What was found
TAKE OFF WARNING HORN AT 40 KNOTS. STOPPED ON RETARDING POWER LEVERS, TAKE OFF WARNING HORN TESTED OK DURING AND AFTER START CHECKLIST. ALL ENGINE AND SPOILER INDICTATIONS OK. ABORTED TAKEOFF AND RETURNED TO GATE. REPLACED CONFIGURATION PLUGS. ELECTRICAL, OPS, AND FUNCTIONAL CHECKED GOOD IAW AMM TASK 71-00-00-868-819, 71-00-00-868-814, 71-00-00-868-816, 45-45-00-710-801, 61-20-00-710-802, 71-00-00-790-801, 27-50-00-710-801, 27-50-00-760-801, PAR 4B. 31-41-00-710-802, 32-62-00-710-801,31-41-16-710-801, 73-21-01-400-801, PAR 5G, 71-00-00-868-817, 31-32-00-710-801, 31-41-11-710-801, AND 6221101, 6273301, 6313201, 6314101, 6342101, 6344401, 6345101, 6346103, AND 6773101. RETURNED TO SERVICE.